Hi Wayne, no I haven't purchased the RCA's or Tung-Sol's - the price is at a point that I call diminishing return on investment. I've heard them, but I don't beleive there is a night and day difference between them and the Electro-Harmonix or Sovtek tubes. I use Welborne Lab's Moondog mono amps and have placed an RCA and a Tung-Sol in one amp and left the other with an Electro-Harmonix or a Sovtek; in my amps there just isn't enough difference to justify the price.I prefer the Electro-Harmonix 2A3's to the Sovtek's, but can happily listen to either.